Mass spectrometer



FIG. 1 is a front perspective view of a mass spectrometer showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown are included for the purpose of illustrating portions of the mass spectrometer that form no part of the claim. 

CLAIM The ornamental design for a mass spectrometer, as shown and described. 